In selecting a material that can undergo large permanent deformations in compression, which property is most important?

In selecting a material that can undergo large permanent deformations in compression, which property is most important?

• A. Hardness
• B. Malleability
• C. Durability
• D. Machinability

Answer: (B)

The key idea is a material’s ability to flow plastically under load. That capability is malleability. When a compressive force is applied, a malleable material can deform significantly and permanently because its structure can rearrange and grains slide without cracking. Hardness fights deformation, so it resists shape change; durability and machinability aren’t about how much a material can permanently deform under compression. Ductility is related to tensile deformation, not compression, so it’s not the best predictor here. So malleability is the most important property for large permanent deformation in compression.

The key idea is a material’s ability to flow plastically under load. That capability is malleability. When a compressive force is applied, a malleable material can deform significantly and permanently because its structure can rearrange and grains slide without cracking. Hardness fights deformation, so it resists shape change; durability and machinability aren’t about how much a material can permanently deform under compression. Ductility is related to tensile deformation, not compression, so it’s not the best predictor here. So malleability is the most important property for large permanent deformation in compression.